behind me the union buildings where nelson mandela's body will lie in state for the next three days. tracie potts, nbc news, pretoria. >> jim vance will be in south africa for the final tributes for his reports starting thursday here on news 4. >>> airline passengers stuck in the terminals for hours. tonight we check in on the delays as the airports try to get back to normal. >>> the federal government was >>> it's been a long week already for the snow removal crews, particularly those in northern virginia. that's where we find news 4's mark segraves who says the work is far from over for a lot of those people out there. mark? >> reporter: that's absolutely right. check this out. is one of four salt domes. last night this dope was filled with 3,000 tons of salt. the crew haves been working here all day. they'll be back here tonight so you can get to work tomorrow morning. >> we're concerned about freeze-back with the temperatures getting back down into the teens. we'll be monitoring and patrolling the bridges, overpasses, ramps, our known hot spots as we call them. >> reporter: by mi